87 citations · 518 across the 17 of their papers we have counts for
18 papers
Interferometric imaging using shared quantum entanglement
Matthew R. Brown, Markus Allgaier, Valérian Thiel +3
Quantum entanglement-based imaging promises significantly increased resolution by extending the spatial separation of optical collection apertures used in very-long-baseline interf…
Tailored frequency conversion makes infrared light visible for streak cameras
Carolin Lüders, Jano Gil-Lopez, Markus Allgaier +4
Streak cameras are one of the most common and convenient devices to measure pulsed emission e.g. from semiconductor lightsources with picosecond time resolution. However, they are…
Smartphone-based measurements of the optical properties of snow
Markus Allgaier, Brian J. Smith
Snow is a highly complex medium composed of ice crystals of various shapes and sizes. Knowledge of its intrinsic optical properties such as the scattering and absorption coefficien…
Direct measurement of optical properties of glacier ice using a photon-counting diffuse LiDAR
Markus Allgaier, Matthew G. Cooper, Anders E. Carlson +3
The production of meltwater from glacier ice, which is exposed at the margins of land ice during the summer, is responsible for a large proportion of glacier mass loss. The rate of…
A modal approach to quantum temporal imaging
G Patera, M Allgaier, D Horoshko +2
We consider the problem of quantum temporal imaging in the case where the time lens is implemented by a Sum Frequency Generation nonlinear process, in particular when the device is…
Quantifying the enhancement of two-photon absorption due to spectral-temporal entanglement
Tiemo Landes, Michael G. Raymer, Markus Allgaier +3
When a low flux of time-frequency-entangled photon pairs (EPP) illuminates a two-photon transition, the rate of two-photon absorption (TPA) can be enhanced considerably by the quan…
Diffuse optics for glaciology
Markus Allgaier, Brian J. Smith
Optical probing of glaciers has the potential for tremendous impact on environmental science. However, glacier ice is turbid, which prohibits the use of most established optical me…
Experimental feasibility of molecular two-photon absorption with isolated time-frequency-entangled photon pairs
Tiemo Landes, Markus Allgaier, Sofiane Merkouche +3
Entangled photon pairs have been promised to deliver a substantial quantum advantage for two-photon absorption spectroscopy. However, recent work has challenged the previously repo…
Two-photon absorption of time-frequency-entangled photon pairs by molecules: the roles of photon-number correlations and spectral correlations
Michael G. Raymer, Tiemo Landes, Markus Allgaier +3
While two-photon absorption (TPA) and other forms of nonlinear interactions of molecules with isolated time-frequency-entangled photon pairs (EPP) have been predicted to display a…
Temporal mode transformations by sequential time and frequency phase modulation for applications in quantum information science
James Ashby, Valerian Thiel, Markus Allgaier +3
Controlling the temporal mode shape of quantum light pulses has wide ranging application to quantum information science and technology. Techniques have been developed to control th…
Pulse shaping using dispersion-engineered difference frequency generation
Markus Allgaier, Vahid Ansari, John Matthew Donohue +5
The temporal-mode (TM) basis is a prime candidate to perform high-dimensional quantum encoding. Quantum frequency conversion has been employed as a tool to perform tomographic anal…
Streak-camera measurements of single photons at telecom wavelength
Markus Allgaier, Vahid Ansari, Christof Eigner +8
Up to this point streak-cameras have been a powerful tool for temporal characterization of ultrafast light pulses even at the single photon level. However, the low signal-to-noise…
Fast time-domain measurements on telecom single photons
Markus Allgaier, Gesche Vigh, Vahid Ansari +5
Direct measurements on the temporal envelope of quantum light are a challenging task and not many examples are known since most classical pulse characterisation methods do not work…
Temporal-mode measurement tomography of a quantum pulse gate
Vahid Ansari, Georg Harder, Markus Allgaier +2
Encoding quantum information in the photon temporal mode (TM) offers a robust platform for high-dimensional quantum protocols. The main practical challenge, however, is to design a…
Highly efficient frequency conversion with bandwidth compression of quantum light
Markus Allgaier, Vahid Ansari, Linda Sansoni +5
Hybrid quantum networks rely on efficient interfacing of dissimilar quantum nodes, since elements based on parametric down-conversion sources, quantum dots, color centres or atoms…
Tomography and Purification of the Temporal-Mode Structure of Quantum Light
Vahid Ansari, John M. Donohue, Markus Allgaier +6
High-dimensional quantum information processing promises capabilities beyond the current state of the art, but addressing individual information-carrying modes presents a significa…
A microwave realization of the Gaussian symplectic ensemble
A. Rehemanjiang, M. Allgaier, C. H. Joyner +4
Following an idea by Joyner et al. [Europhys. Lett. 107, 50004 (2014)] a microwave graph with an antiunitary symmetry T obeying T^2=-1 is realized. The Kramers doublets expected fo…
Spectral properties of microwave graphs with local absorption
M. Allgaier, S. Gehler, S. Barkhofen +2
The influence of absorption on the spectra of microwave graphs has been studied experimentally. The microwave networks were made up of coaxial cables and T junctions. First, absorp…